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linux-zen-desktop/drivers/power/supply/rt9467-charger.c

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Initial commit
2023-08-30 17:31:07 +02:00
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2022 Richtek Technology Corp.
*
* Author: ChiYuan Huang <cy_huang@richtek.com>
* ChiaEn Wu <chiaen_wu@richtek.com>
*/
#include <linux/bits.h>
#include <linux/bitfield.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/kstrtox.h>
#include <linux/linear_range.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/units.h>
#include <linux/sysfs.h>
#define RT9467_REG_CORE_CTRL0 0x00
#define RT9467_REG_CHG_CTRL1 0x01
#define RT9467_REG_CHG_CTRL2 0x02
#define RT9467_REG_CHG_CTRL3 0x03
#define RT9467_REG_CHG_CTRL4 0x04
#define RT9467_REG_CHG_CTRL5 0x05
#define RT9467_REG_CHG_CTRL6 0x06
#define RT9467_REG_CHG_CTRL7 0x07
#define RT9467_REG_CHG_CTRL8 0x08
#define RT9467_REG_CHG_CTRL9 0x09
#define RT9467_REG_CHG_CTRL10 0x0A
#define RT9467_REG_CHG_CTRL12 0x0C
#define RT9467_REG_CHG_CTRL13 0x0D
#define RT9467_REG_CHG_CTRL14 0x0E
#define RT9467_REG_CHG_ADC 0x11
#define RT9467_REG_CHG_DPDM1 0x12
#define RT9467_REG_CHG_DPDM2 0x13
#define RT9467_REG_DEVICE_ID 0x40
#define RT9467_REG_CHG_STAT 0x42
#define RT9467_REG_ADC_DATA_H 0x44
#define RT9467_REG_CHG_STATC 0x50
#define RT9467_REG_CHG_IRQ1 0x53
#define RT9467_REG_CHG_STATC_CTRL 0x60
#define RT9467_REG_CHG_IRQ1_CTRL 0x63
#define RT9467_MASK_PWR_RDY BIT(7)
#define RT9467_MASK_MIVR_STAT BIT(6)
#define RT9467_MASK_OTG_CSEL GENMASK(2, 0)
#define RT9467_MASK_OTG_VSEL GENMASK(7, 2)
#define RT9467_MASK_OTG_EN BIT(0)
#define RT9467_MASK_ADC_IN_SEL GENMASK(7, 4)
#define RT9467_MASK_ADC_START BIT(0)
#define RT9467_NUM_IRQ_REGS 4
#define RT9467_ICHG_MIN_uA 100000
#define RT9467_ICHG_MAX_uA 5000000
#define RT9467_CV_MAX_uV 4710000
#define RT9467_OTG_MIN_uV 4425000
#define RT9467_OTG_MAX_uV 5825000
#define RT9467_OTG_STEP_uV 25000
#define RT9467_NUM_VOTG (RT9467_OTG_MAX_uV - RT9467_OTG_MIN_uV + 1)
#define RT9467_AICLVTH_GAP_uV 200000
#define RT9467_ADCCONV_TIME_MS 35
#define RT9466_VID 0x8
#define RT9467_VID 0x9
/* IRQ number */
#define RT9467_IRQ_TS_STATC 0
#define RT9467_IRQ_CHG_FAULT 1
#define RT9467_IRQ_CHG_STATC 2
#define RT9467_IRQ_CHG_TMR 3
#define RT9467_IRQ_CHG_BATABS 4
#define RT9467_IRQ_CHG_ADPBAD 5
#define RT9467_IRQ_CHG_RVP 6
#define RT9467_IRQ_OTP 7
#define RT9467_IRQ_CHG_AICLM 8
#define RT9467_IRQ_CHG_ICHGM 9
#define RT9467_IRQ_WDTMR 11
#define RT9467_IRQ_SSFINISH 12
#define RT9467_IRQ_CHG_RECHG 13
#define RT9467_IRQ_CHG_TERM 14
#define RT9467_IRQ_CHG_IEOC 15
#define RT9467_IRQ_ADC_DONE 16
#define RT9467_IRQ_PUMPX_DONE 17
#define RT9467_IRQ_BST_BATUV 21
#define RT9467_IRQ_BST_MIDOV 22
#define RT9467_IRQ_BST_OLP 23
#define RT9467_IRQ_ATTACH 24
#define RT9467_IRQ_DETACH 25
#define RT9467_IRQ_HVDCP_DET 29
#define RT9467_IRQ_CHGDET 30
#define RT9467_IRQ_DCDT 31
enum rt9467_fields {
/* RT9467_REG_CORE_CTRL0 */
F_RST = 0,
/* RT9467_REG_CHG_CTRL1 */
F_HZ, F_OTG_PIN_EN, F_OPA_MODE,
/* RT9467_REG_CHG_CTRL2 */
F_SHIP_MODE, F_TE, F_IINLMTSEL, F_CFO_EN, F_CHG_EN,
/* RT9467_REG_CHG_CTRL3 */
F_IAICR, F_ILIM_EN,
/* RT9467_REG_CHG_CTRL4 */
F_VOREG,
/* RT9467_REG_CHG_CTRL6 */
F_VMIVR,
/* RT9467_REG_CHG_CTRL7 */
F_ICHG,
/* RT9467_REG_CHG_CTRL8 */
F_IPREC,
/* RT9467_REG_CHG_CTRL9 */
F_IEOC,
/* RT9467_REG_CHG_CTRL12 */
F_WT_FC,
/* RT9467_REG_CHG_CTRL13 */
F_OCP,
/* RT9467_REG_CHG_CTRL14 */
F_AICL_MEAS, F_AICL_VTH,
/* RT9467_REG_CHG_DPDM1 */
F_USBCHGEN,
/* RT9467_REG_CHG_DPDM2 */
F_USB_STATUS,
/* RT9467_REG_DEVICE_ID */
F_VENDOR,
/* RT9467_REG_CHG_STAT */
F_CHG_STAT,
/* RT9467_REG_CHG_STATC */
F_PWR_RDY, F_CHG_MIVR,
F_MAX_FIELDS
};
static const struct regmap_irq rt9467_irqs[] = {
REGMAP_IRQ_REG_LINE(RT9467_IRQ_TS_STATC, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_CHG_FAULT, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_CHG_STATC, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_CHG_TMR, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_CHG_BATABS, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_CHG_ADPBAD, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_CHG_RVP, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_OTP, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_CHG_AICLM, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_CHG_ICHGM, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_WDTMR, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_SSFINISH, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_CHG_RECHG, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_CHG_TERM, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_CHG_IEOC, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_ADC_DONE, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_PUMPX_DONE, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_BST_BATUV, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_BST_MIDOV, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_BST_OLP, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_ATTACH, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_DETACH, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_HVDCP_DET, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_CHGDET, 8),
REGMAP_IRQ_REG_LINE(RT9467_IRQ_DCDT, 8)
};
static const struct regmap_irq_chip rt9467_irq_chip = {
.name = "rt9467-irqs",
.status_base = RT9467_REG_CHG_IRQ1,
.mask_base = RT9467_REG_CHG_IRQ1_CTRL,
.num_regs = RT9467_NUM_IRQ_REGS,
.irqs = rt9467_irqs,
.num_irqs = ARRAY_SIZE(rt9467_irqs),
};
enum rt9467_ranges {
RT9467_RANGE_IAICR = 0,
RT9467_RANGE_VOREG,
RT9467_RANGE_VMIVR,
RT9467_RANGE_ICHG,
RT9467_RANGE_IPREC,
RT9467_RANGE_IEOC,
RT9467_RANGE_AICL_VTH,
RT9467_RANGES_MAX
};
static const struct linear_range rt9467_ranges[RT9467_RANGES_MAX] = {
LINEAR_RANGE_IDX(RT9467_RANGE_IAICR, 100000, 0x0, 0x3F, 50000),
LINEAR_RANGE_IDX(RT9467_RANGE_VOREG, 3900000, 0x0, 0x51, 10000),
LINEAR_RANGE_IDX(RT9467_RANGE_VMIVR, 3900000, 0x0, 0x5F, 100000),
LINEAR_RANGE_IDX(RT9467_RANGE_ICHG, 900000, 0x08, 0x31, 100000),
LINEAR_RANGE_IDX(RT9467_RANGE_IPREC, 100000, 0x0, 0x0F, 50000),
LINEAR_RANGE_IDX(RT9467_RANGE_IEOC, 100000, 0x0, 0x0F, 50000),
LINEAR_RANGE_IDX(RT9467_RANGE_AICL_VTH, 4100000, 0x0, 0x7, 100000),
};
static const struct reg_field rt9467_chg_fields[] = {
[F_RST] = REG_FIELD(RT9467_REG_CORE_CTRL0, 7, 7),
[F_HZ] = REG_FIELD(RT9467_REG_CHG_CTRL1, 2, 2),
[F_OTG_PIN_EN] = REG_FIELD(RT9467_REG_CHG_CTRL1, 1, 1),
[F_OPA_MODE] = REG_FIELD(RT9467_REG_CHG_CTRL1, 0, 0),
[F_SHIP_MODE] = REG_FIELD(RT9467_REG_CHG_CTRL2, 7, 7),
[F_TE] = REG_FIELD(RT9467_REG_CHG_CTRL2, 4, 4),
[F_IINLMTSEL] = REG_FIELD(RT9467_REG_CHG_CTRL2, 2, 3),
[F_CFO_EN] = REG_FIELD(RT9467_REG_CHG_CTRL2, 1, 1),
[F_CHG_EN] = REG_FIELD(RT9467_REG_CHG_CTRL2, 0, 0),
[F_IAICR] = REG_FIELD(RT9467_REG_CHG_CTRL3, 2, 7),
[F_ILIM_EN] = REG_FIELD(RT9467_REG_CHG_CTRL3, 0, 0),
[F_VOREG] = REG_FIELD(RT9467_REG_CHG_CTRL4, 1, 7),
[F_VMIVR] = REG_FIELD(RT9467_REG_CHG_CTRL6, 1, 7),
[F_ICHG] = REG_FIELD(RT9467_REG_CHG_CTRL7, 2, 7),
[F_IPREC] = REG_FIELD(RT9467_REG_CHG_CTRL8, 0, 3),
[F_IEOC] = REG_FIELD(RT9467_REG_CHG_CTRL9, 4, 7),
[F_WT_FC] = REG_FIELD(RT9467_REG_CHG_CTRL12, 5, 7),
[F_OCP] = REG_FIELD(RT9467_REG_CHG_CTRL13, 2, 2),
[F_AICL_MEAS] = REG_FIELD(RT9467_REG_CHG_CTRL14, 7, 7),
[F_AICL_VTH] = REG_FIELD(RT9467_REG_CHG_CTRL14, 0, 2),
[F_USBCHGEN] = REG_FIELD(RT9467_REG_CHG_DPDM1, 7, 7),
[F_USB_STATUS] = REG_FIELD(RT9467_REG_CHG_DPDM2, 0, 2),
[F_VENDOR] = REG_FIELD(RT9467_REG_DEVICE_ID, 4, 7),
[F_CHG_STAT] = REG_FIELD(RT9467_REG_CHG_STAT, 6, 7),
[F_PWR_RDY] = REG_FIELD(RT9467_REG_CHG_STATC, 7, 7),
[F_CHG_MIVR] = REG_FIELD(RT9467_REG_CHG_STATC, 6, 6),
};
enum {
RT9467_STAT_READY = 0,
RT9467_STAT_PROGRESS,
RT9467_STAT_CHARGE_DONE,
RT9467_STAT_FAULT
};
enum rt9467_adc_chan {
RT9467_ADC_VBUS_DIV5 = 0,
RT9467_ADC_VBUS_DIV2,
RT9467_ADC_VSYS,
RT9467_ADC_VBAT,
RT9467_ADC_TS_BAT,
RT9467_ADC_IBUS,
RT9467_ADC_IBAT,
RT9467_ADC_REGN,
RT9467_ADC_TEMP_JC
};
enum rt9467_chg_type {
RT9467_CHG_TYPE_NOVBUS = 0,
RT9467_CHG_TYPE_UNDER_GOING,
RT9467_CHG_TYPE_SDP,
RT9467_CHG_TYPE_SDPNSTD,
RT9467_CHG_TYPE_DCP,
RT9467_CHG_TYPE_CDP,
RT9467_CHG_TYPE_MAX
};
enum rt9467_iin_limit_sel {
RT9467_IINLMTSEL_3_2A = 0,
RT9467_IINLMTSEL_CHG_TYP,
RT9467_IINLMTSEL_AICR,
RT9467_IINLMTSEL_LOWER_LEVEL, /* lower of above three */
};
struct rt9467_chg_data {
struct device *dev;
struct regmap *regmap;
struct regmap_field *rm_field[F_MAX_FIELDS];
struct regmap_irq_chip_data *irq_chip_data;
struct power_supply *psy;
struct mutex adc_lock;
struct mutex attach_lock;
struct mutex ichg_ieoc_lock;
struct regulator_dev *rdev;
struct completion aicl_done;
enum power_supply_usb_type psy_usb_type;
unsigned int old_stat;
unsigned int vid;
int ichg_ua;
int ieoc_ua;
};
static int rt9467_otg_of_parse_cb(struct device_node *of,
const struct regulator_desc *desc,
struct regulator_config *cfg)
{
struct rt9467_chg_data *data = cfg->driver_data;
cfg->ena_gpiod = fwnode_gpiod_get_index(of_fwnode_handle(of),
"enable", 0, GPIOD_OUT_LOW |
GPIOD_FLAGS_BIT_NONEXCLUSIVE,
desc->name);
if (IS_ERR(cfg->ena_gpiod)) {
cfg->ena_gpiod = NULL;
return 0;
}
return regmap_field_write(data->rm_field[F_OTG_PIN_EN], 1);
}
static const struct regulator_ops rt9467_otg_regulator_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_linear,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_current_limit = regulator_set_current_limit_regmap,
.get_current_limit = regulator_get_current_limit_regmap,
};
static const u32 rt9467_otg_microamp[] = {
500000, 700000, 1100000, 1300000, 1800000, 2100000, 2400000, 3000000
};
static const struct regulator_desc rt9467_otg_desc = {
.name = "rt9476-usb-otg-vbus",
.of_match = "usb-otg-vbus-regulator",
.of_parse_cb = rt9467_otg_of_parse_cb,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
.min_uV = RT9467_OTG_MIN_uV,
.uV_step = RT9467_OTG_STEP_uV,
.n_voltages = RT9467_NUM_VOTG,
.curr_table = rt9467_otg_microamp,
.n_current_limits = ARRAY_SIZE(rt9467_otg_microamp),
.csel_reg = RT9467_REG_CHG_CTRL10,
.csel_mask = RT9467_MASK_OTG_CSEL,
.vsel_reg = RT9467_REG_CHG_CTRL5,
.vsel_mask = RT9467_MASK_OTG_VSEL,
.enable_reg = RT9467_REG_CHG_CTRL1,
.enable_mask = RT9467_MASK_OTG_EN,
.ops = &rt9467_otg_regulator_ops,
};
static int rt9467_register_otg_regulator(struct rt9467_chg_data *data)
{
struct regulator_config cfg = {
.dev = data->dev,
.regmap = data->regmap,
.driver_data = data,
};
data->rdev = devm_regulator_register(data->dev, &rt9467_otg_desc, &cfg);
return PTR_ERR_OR_ZERO(data->rdev);
}
static int rt9467_get_value_from_ranges(struct rt9467_chg_data *data,
enum rt9467_fields field,
enum rt9467_ranges rsel,
int *value)
{
const struct linear_range *range = rt9467_ranges + rsel;
unsigned int sel;
int ret;
ret = regmap_field_read(data->rm_field[field], &sel);
if (ret)
return ret;
return linear_range_get_value(range, sel, value);
}
static int rt9467_set_value_from_ranges(struct rt9467_chg_data *data,
enum rt9467_fields field,
enum rt9467_ranges rsel,
int value)
{
const struct linear_range *range = rt9467_ranges + rsel;
unsigned int sel;
bool found;
int ret;
if (rsel == RT9467_RANGE_VMIVR) {
ret = linear_range_get_selector_high(range, value, &sel, &found);
if (ret)
value = range->max_sel;
} else {
linear_range_get_selector_within(range, value, &sel);
}
return regmap_field_write(data->rm_field[field], sel);
}
static int rt9467_get_adc_sel(enum rt9467_adc_chan chan, int *sel)
{
switch (chan) {
case RT9467_ADC_VBUS_DIV5:
case RT9467_ADC_VBUS_DIV2:
case RT9467_ADC_VSYS:
case RT9467_ADC_VBAT:
*sel = chan + 1;
return 0;
case RT9467_ADC_TS_BAT:
*sel = chan + 2;
return 0;
case RT9467_ADC_IBUS:
case RT9467_ADC_IBAT:
*sel = chan + 3;
return 0;
case RT9467_ADC_REGN:
case RT9467_ADC_TEMP_JC:
*sel = chan + 4;
return 0;
default:
return -EINVAL;
}
}
static int rt9467_get_adc_raw_data(struct rt9467_chg_data *data,
enum rt9467_adc_chan chan, int *val)
{
unsigned int adc_stat, reg_val, adc_sel;
__be16 chan_raw_data;
int ret;
mutex_lock(&data->adc_lock);
ret = rt9467_get_adc_sel(chan, &adc_sel);
if (ret)
goto adc_unlock;
ret = regmap_write(data->regmap, RT9467_REG_CHG_ADC, 0);
if (ret) {
dev_err(data->dev, "Failed to clear ADC enable\n");
goto adc_unlock;
}
reg_val = RT9467_MASK_ADC_START | FIELD_PREP(RT9467_MASK_ADC_IN_SEL, adc_sel);
ret = regmap_write(data->regmap, RT9467_REG_CHG_ADC, reg_val);
if (ret)
goto adc_unlock;
/* Minimum wait time for one channel processing */
msleep(RT9467_ADCCONV_TIME_MS);
ret = regmap_read_poll_timeout(data->regmap, RT9467_REG_CHG_ADC,
adc_stat,
!(adc_stat & RT9467_MASK_ADC_START),
MILLI, RT9467_ADCCONV_TIME_MS * MILLI);
if (ret) {
dev_err(data->dev, "Failed to wait ADC conversion, chan = %d\n", chan);
goto adc_unlock;
}
ret = regmap_raw_read(data->regmap, RT9467_REG_ADC_DATA_H,
&chan_raw_data, sizeof(chan_raw_data));
if (ret)
goto adc_unlock;
*val = be16_to_cpu(chan_raw_data);
adc_unlock:
mutex_unlock(&data->adc_lock);
return ret;
}
static int rt9467_get_adc(struct rt9467_chg_data *data,
enum rt9467_adc_chan chan, int *val)
{
unsigned int aicr_ua, ichg_ua;
int ret;
ret = rt9467_get_adc_raw_data(data, chan, val);
if (ret)
return ret;
switch (chan) {
case RT9467_ADC_VBUS_DIV5:
*val *= 25000;
return 0;
case RT9467_ADC_VBUS_DIV2:
*val *= 10000;
return 0;
case RT9467_ADC_VBAT:
case RT9467_ADC_VSYS:
case RT9467_ADC_REGN:
*val *= 5000;
return 0;
case RT9467_ADC_TS_BAT:
*val /= 400;
return 0;
case RT9467_ADC_IBUS:
/* UUG MOS turn-on ratio will affect the IBUS adc scale */
ret = rt9467_get_value_from_ranges(data, F_IAICR,
RT9467_RANGE_IAICR, &aicr_ua);
if (ret)
return ret;
*val *= aicr_ua < 400000 ? 29480 : 50000;
return 0;
case RT9467_ADC_IBAT:
/* PP MOS turn-on ratio will affect the ICHG adc scale */
ret = rt9467_get_value_from_ranges(data, F_ICHG,
RT9467_RANGE_ICHG, &ichg_ua);
if (ret)
return ret;
*val *= ichg_ua <= 400000 ? 28500 :
ichg_ua <= 800000 ? 31500 : 500000;
return 0;
case RT9467_ADC_TEMP_JC:
*val = ((*val * 2) - 40) * 10;
return 0;
default:
return -EINVAL;
}
}
static int rt9467_psy_get_status(struct rt9467_chg_data *data, int *state)
{
unsigned int status;
int ret;
ret = regmap_field_read(data->rm_field[F_CHG_STAT], &status);
if (ret)
return ret;
switch (status) {
case RT9467_STAT_READY:
*state = POWER_SUPPLY_STATUS_NOT_CHARGING;
return 0;
case RT9467_STAT_PROGRESS:
*state = POWER_SUPPLY_STATUS_CHARGING;
return 0;
case RT9467_STAT_CHARGE_DONE:
*state = POWER_SUPPLY_STATUS_FULL;
return 0;
default:
*state = POWER_SUPPLY_STATUS_UNKNOWN;
return 0;
}
}
static int rt9467_psy_set_ichg(struct rt9467_chg_data *data, int microamp)
{
int ret;
mutex_lock(&data->ichg_ieoc_lock);
if (microamp < 500000) {
dev_err(data->dev, "Minimum value must be 500mA\n");
microamp = 500000;
}
ret = rt9467_set_value_from_ranges(data, F_ICHG, RT9467_RANGE_ICHG, microamp);
if (ret)
goto out;
ret = rt9467_get_value_from_ranges(data, F_ICHG, RT9467_RANGE_ICHG,
&data->ichg_ua);
if (ret)
goto out;
out:
mutex_unlock(&data->ichg_ieoc_lock);
return ret;
}
static int rt9467_run_aicl(struct rt9467_chg_data *data)
{
unsigned int statc, aicl_vth;
int mivr_vth, aicr_get;
int ret = 0;
ret = regmap_read(data->regmap, RT9467_REG_CHG_STATC, &statc);
if (ret) {
dev_err(data->dev, "Failed to read status\n");
return ret;
}
if (!(statc & RT9467_MASK_PWR_RDY) || !(statc & RT9467_MASK_MIVR_STAT)) {
dev_info(data->dev, "Condition not matched %d\n", statc);
return 0;
}
ret = rt9467_get_value_from_ranges(data, F_VMIVR, RT9467_RANGE_VMIVR,
&mivr_vth);
if (ret) {
dev_err(data->dev, "Failed to get mivr\n");
return ret;
}
/* AICL_VTH = MIVR_VTH + 200mV */
aicl_vth = mivr_vth + RT9467_AICLVTH_GAP_uV;
ret = rt9467_set_value_from_ranges(data, F_AICL_VTH,
RT9467_RANGE_AICL_VTH, aicl_vth);
/* Trigger AICL function */
ret = regmap_field_write(data->rm_field[F_AICL_MEAS], 1);
if (ret) {
dev_err(data->dev, "Failed to set aicl measurement\n");
return ret;
}
reinit_completion(&data->aicl_done);
ret = wait_for_completion_timeout(&data->aicl_done, msecs_to_jiffies(3500));
if (ret)
return ret;
ret = rt9467_get_value_from_ranges(data, F_IAICR, RT9467_RANGE_IAICR, &aicr_get);
if (ret) {
dev_err(data->dev, "Failed to get aicr\n");
return ret;
}
dev_info(data->dev, "aicr get = %d uA\n", aicr_get);
return 0;
}
static int rt9467_psy_set_ieoc(struct rt9467_chg_data *data, int microamp)
{
int ret;
mutex_lock(&data->ichg_ieoc_lock);
ret = rt9467_set_value_from_ranges(data, F_IEOC, RT9467_RANGE_IEOC, microamp);
if (ret)
goto out;
ret = rt9467_get_value_from_ranges(data, F_IEOC, RT9467_RANGE_IEOC, &data->ieoc_ua);
if (ret)
goto out;
out:
mutex_unlock(&data->ichg_ieoc_lock);
return ret;
}
static const enum power_supply_usb_type rt9467_chg_usb_types[] = {
POWER_SUPPLY_USB_TYPE_UNKNOWN,
POWER_SUPPLY_USB_TYPE_SDP,
POWER_SUPPLY_USB_TYPE_DCP,
POWER_SUPPLY_USB_TYPE_CDP,
};
static const enum power_supply_property rt9467_chg_properties[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_CURRENT_MAX,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT,
POWER_SUPPLY_PROP_USB_TYPE,
POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
};
static int rt9467_psy_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct rt9467_chg_data *data = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
return rt9467_psy_get_status(data, &val->intval);
case POWER_SUPPLY_PROP_ONLINE:
return regmap_field_read(data->rm_field[F_PWR_RDY], &val->intval);
case POWER_SUPPLY_PROP_CURRENT_MAX:
mutex_lock(&data->attach_lock);
if (data->psy_usb_type == POWER_SUPPLY_USB_TYPE_UNKNOWN ||
data->psy_usb_type == POWER_SUPPLY_USB_TYPE_SDP)
val->intval = 500000;
else
val->intval = 1500000;
mutex_unlock(&data->attach_lock);
return 0;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
mutex_lock(&data->ichg_ieoc_lock);
val->intval = data->ichg_ua;
mutex_unlock(&data->ichg_ieoc_lock);
return 0;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
val->intval = RT9467_ICHG_MAX_uA;
return 0;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
return rt9467_get_value_from_ranges(data, F_VOREG,
RT9467_RANGE_VOREG,
&val->intval);
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
val->intval = RT9467_CV_MAX_uV;
return 0;
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
return rt9467_get_value_from_ranges(data, F_IAICR,
RT9467_RANGE_IAICR,
&val->intval);
case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
return rt9467_get_value_from_ranges(data, F_VMIVR,
RT9467_RANGE_VMIVR,
&val->intval);
case POWER_SUPPLY_PROP_USB_TYPE:
mutex_lock(&data->attach_lock);
val->intval = data->psy_usb_type;
mutex_unlock(&data->attach_lock);
return 0;
case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
return rt9467_get_value_from_ranges(data, F_IPREC,
RT9467_RANGE_IPREC,
&val->intval);
case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
mutex_lock(&data->ichg_ieoc_lock);
val->intval = data->ieoc_ua;
mutex_unlock(&data->ichg_ieoc_lock);
return 0;
default:
return -ENODATA;
}
}
static int rt9467_psy_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct rt9467_chg_data *data = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
return regmap_field_write(data->rm_field[F_CHG_EN], val->intval);
case POWER_SUPPLY_PROP_ONLINE:
return regmap_field_write(data->rm_field[F_HZ], val->intval);
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
return rt9467_psy_set_ichg(data, val->intval);
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
return rt9467_set_value_from_ranges(data, F_VOREG,
RT9467_RANGE_VOREG, val->intval);
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
if (val->intval == -1)
return rt9467_run_aicl(data);
else
return rt9467_set_value_from_ranges(data, F_IAICR,
RT9467_RANGE_IAICR,
val->intval);
case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
return rt9467_set_value_from_ranges(data, F_VMIVR,
RT9467_RANGE_VMIVR, val->intval);
case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
return rt9467_set_value_from_ranges(data, F_IPREC,
RT9467_RANGE_IPREC, val->intval);
case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
return rt9467_psy_set_ieoc(data, val->intval);
case POWER_SUPPLY_PROP_USB_TYPE:
return regmap_field_write(data->rm_field[F_USBCHGEN], val->intval);
default:
return -EINVAL;
}
}
static int rt9467_chg_prop_is_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
case POWER_SUPPLY_PROP_ONLINE:
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
case POWER_SUPPLY_PROP_USB_TYPE:
return 1;
default:
return 0;
}
}
static const struct power_supply_desc rt9467_chg_psy_desc = {
.name = "rt9467-charger",
.type = POWER_SUPPLY_TYPE_USB,
.usb_types = rt9467_chg_usb_types,
.num_usb_types = ARRAY_SIZE(rt9467_chg_usb_types),
.properties = rt9467_chg_properties,
.num_properties = ARRAY_SIZE(rt9467_chg_properties),
.property_is_writeable = rt9467_chg_prop_is_writeable,
.get_property = rt9467_psy_get_property,
.set_property = rt9467_psy_set_property,
};
static inline struct rt9467_chg_data *psy_device_to_chip(struct device *dev)
{
return power_supply_get_drvdata(to_power_supply(dev));
}
static ssize_t sysoff_enable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct rt9467_chg_data *data = psy_device_to_chip(dev);
unsigned int sysoff_enable;
int ret;
ret = regmap_field_read(data->rm_field[F_SHIP_MODE], &sysoff_enable);
if (ret)
return ret;
return sysfs_emit(buf, "%d\n", sysoff_enable);
}
static ssize_t sysoff_enable_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct rt9467_chg_data *data = psy_device_to_chip(dev);
unsigned int tmp;
int ret;
ret = kstrtouint(buf, 10, &tmp);
if (ret)
return ret;
ret = regmap_field_write(data->rm_field[F_SHIP_MODE], !!tmp);
if (ret)
return ret;
return count;
}
static DEVICE_ATTR_RW(sysoff_enable);
static struct attribute *rt9467_sysfs_attrs[] = {
&dev_attr_sysoff_enable.attr,
NULL
};
ATTRIBUTE_GROUPS(rt9467_sysfs);
static int rt9467_register_psy(struct rt9467_chg_data *data)
{
struct power_supply_config cfg = {
.drv_data = data,
.of_node = dev_of_node(data->dev),
.attr_grp = rt9467_sysfs_groups,
};
data->psy = devm_power_supply_register(data->dev, &rt9467_chg_psy_desc,
&cfg);
return PTR_ERR_OR_ZERO(data->psy);
}
static int rt9467_mivr_handler(struct rt9467_chg_data *data)
{
unsigned int mivr_act;
int ret, ibus_ma;
/*
* back-boost workaround
* If (mivr_active & ibus < 100mA), toggle cfo bit
*/
ret = regmap_field_read(data->rm_field[F_CHG_MIVR], &mivr_act);
if (ret) {
dev_err(data->dev, "Failed to read MIVR stat\n");
return ret;
}
if (!mivr_act)
return 0;
ret = rt9467_get_adc(data, RT9467_ADC_IBUS, &ibus_ma);
if (ret) {
dev_err(data->dev, "Failed to get IBUS\n");
return ret;
}
if (ibus_ma < 100000) {
ret = regmap_field_write(data->rm_field[F_CFO_EN], 0);
ret |= regmap_field_write(data->rm_field[F_CFO_EN], 1);
if (ret)
dev_err(data->dev, "Failed to toggle cfo\n");
}
return ret;
}
static irqreturn_t rt9467_statc_handler(int irq, void *priv)
{
struct rt9467_chg_data *data = priv;
unsigned int new_stat, evts = 0;
int ret;
ret = regmap_read(data->regmap, RT9467_REG_CHG_STATC, &new_stat);
if (ret) {
dev_err(data->dev, "Failed to read chg_statc\n");
return IRQ_NONE;
}
evts = data->old_stat ^ new_stat;
data->old_stat = new_stat;
if ((evts & new_stat) & RT9467_MASK_MIVR_STAT) {
ret = rt9467_mivr_handler(data);
if (ret)
dev_err(data->dev, "Failed to handle mivr stat\n");
}
return IRQ_HANDLED;
}
static irqreturn_t rt9467_wdt_handler(int irq, void *priv)
{
struct rt9467_chg_data *data = priv;
unsigned int dev_id;
int ret;
/* Any i2c communication can kick watchdog timer */
ret = regmap_read(data->regmap, RT9467_REG_DEVICE_ID, &dev_id);
if (ret) {
dev_err(data->dev, "Failed to kick wdt (%d)\n", ret);
return IRQ_NONE;
}
return IRQ_HANDLED;
}
static int rt9467_report_usb_state(struct rt9467_chg_data *data)
{
unsigned int usb_stat, power_ready;
bool psy_changed = true;
int ret;
ret = regmap_field_read(data->rm_field[F_USB_STATUS], &usb_stat);
ret |= regmap_field_read(data->rm_field[F_PWR_RDY], &power_ready);
if (ret)
return ret;
if (!power_ready)
usb_stat = RT9467_CHG_TYPE_NOVBUS;
mutex_lock(&data->attach_lock);
switch (usb_stat) {
case RT9467_CHG_TYPE_NOVBUS:
data->psy_usb_type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
break;
case RT9467_CHG_TYPE_SDP:
data->psy_usb_type = POWER_SUPPLY_USB_TYPE_SDP;
break;
case RT9467_CHG_TYPE_SDPNSTD:
data->psy_usb_type = POWER_SUPPLY_USB_TYPE_DCP;
break;
case RT9467_CHG_TYPE_DCP:
data->psy_usb_type = POWER_SUPPLY_USB_TYPE_DCP;
break;
case RT9467_CHG_TYPE_CDP:
data->psy_usb_type = POWER_SUPPLY_USB_TYPE_CDP;
break;
case RT9467_CHG_TYPE_UNDER_GOING:
default:
psy_changed = false;
break;
}
mutex_unlock(&data->attach_lock);
if (psy_changed)
power_supply_changed(data->psy);
return 0;
}
static irqreturn_t rt9467_usb_state_handler(int irq, void *priv)
{
struct rt9467_chg_data *data = priv;
int ret;
ret = rt9467_report_usb_state(data);
if (ret) {
dev_err(data->dev, "Failed to report attach type (%d)\n", ret);
return IRQ_NONE;
}
return IRQ_HANDLED;
}
static irqreturn_t rt9467_aiclmeas_handler(int irq, void *priv)
{
struct rt9467_chg_data *data = priv;
complete(&data->aicl_done);
return IRQ_HANDLED;
}
#define RT9467_IRQ_DESC(_name, _handler_func, _hwirq) \
{ \
.name = #_name, \
.handler = rt9467_##_handler_func##_handler, \
.hwirq = _hwirq, \
}
static int rt9467_request_interrupt(struct rt9467_chg_data *data)
{
struct device *dev = data->dev;
static const struct {
const char *name;
int hwirq;
irq_handler_t handler;
} rt9467_exclusive_irqs[] = {
RT9467_IRQ_DESC(statc, statc, RT9467_IRQ_TS_STATC),
RT9467_IRQ_DESC(wdt, wdt, RT9467_IRQ_WDTMR),
RT9467_IRQ_DESC(attach, usb_state, RT9467_IRQ_ATTACH),
RT9467_IRQ_DESC(detach, usb_state, RT9467_IRQ_DETACH),
RT9467_IRQ_DESC(aiclmeas, aiclmeas, RT9467_IRQ_CHG_AICLM),
}, rt9466_exclusive_irqs[] = {
RT9467_IRQ_DESC(statc, statc, RT9467_IRQ_TS_STATC),
RT9467_IRQ_DESC(wdt, wdt, RT9467_IRQ_WDTMR),
RT9467_IRQ_DESC(aiclmeas, aiclmeas, RT9467_IRQ_CHG_AICLM),
}, *chg_irqs;
int num_chg_irqs, i, virq, ret;
if (data->vid == RT9466_VID) {
chg_irqs = rt9466_exclusive_irqs;
num_chg_irqs = ARRAY_SIZE(rt9466_exclusive_irqs);
} else {
chg_irqs = rt9467_exclusive_irqs;
num_chg_irqs = ARRAY_SIZE(rt9467_exclusive_irqs);
}
for (i = 0; i < num_chg_irqs; i++) {
virq = regmap_irq_get_virq(data->irq_chip_data, chg_irqs[i].hwirq);
if (virq <= 0)
return dev_err_probe(dev, -EINVAL, "Failed to get (%s) irq\n",
chg_irqs[i].name);
ret = devm_request_threaded_irq(dev, virq, NULL, chg_irqs[i].handler,
IRQF_ONESHOT, chg_irqs[i].name, data);
if (ret)
return dev_err_probe(dev, ret, "Failed to request (%s) irq\n",
chg_irqs[i].name);
}
return 0;
}
static int rt9467_do_charger_init(struct rt9467_chg_data *data)
{
struct device *dev = data->dev;
int ret;
ret = regmap_write(data->regmap, RT9467_REG_CHG_ADC, 0);
if (ret)
return dev_err_probe(dev, ret, "Failed to reset ADC\n");
ret = rt9467_get_value_from_ranges(data, F_ICHG, RT9467_RANGE_ICHG,
&data->ichg_ua);
ret |= rt9467_get_value_from_ranges(data, F_IEOC, RT9467_RANGE_IEOC,
&data->ieoc_ua);
if (ret)
return dev_err_probe(dev, ret, "Failed to init ichg/ieoc value\n");
ret = regmap_update_bits(data->regmap, RT9467_REG_CHG_STATC_CTRL,
RT9467_MASK_PWR_RDY | RT9467_MASK_MIVR_STAT, 0);
if (ret)
return dev_err_probe(dev, ret, "Failed to make statc unmask\n");
/* Select IINLMTSEL to use AICR */
ret = regmap_field_write(data->rm_field[F_IINLMTSEL],
RT9467_IINLMTSEL_AICR);
if (ret)
return dev_err_probe(dev, ret, "Failed to set iinlmtsel to AICR\n");
/* Wait for AICR Rampping */
msleep(150);
/* Disable hardware ILIM */
ret = regmap_field_write(data->rm_field[F_ILIM_EN], 0);
if (ret)
return dev_err_probe(dev, ret, "Failed to disable hardware ILIM\n");
/* Set inductor OCP to high level */
ret = regmap_field_write(data->rm_field[F_OCP], 1);
if (ret)
return dev_err_probe(dev, ret, "Failed to set higher inductor OCP level\n");
/* Set charge termination default enable */
ret = regmap_field_write(data->rm_field[F_TE], 1);
if (ret)
return dev_err_probe(dev, ret, "Failed to set TE=1\n");
/* Set 12hrs fast charger timer */
ret = regmap_field_write(data->rm_field[F_WT_FC], 4);
if (ret)
return dev_err_probe(dev, ret, "Failed to set WT_FC\n");
/* Toggle BC12 function */
ret = regmap_field_write(data->rm_field[F_USBCHGEN], 0);
if (ret)
return dev_err_probe(dev, ret, "Failed to disable BC12\n");
return regmap_field_write(data->rm_field[F_USBCHGEN], 1);
}
static bool rt9467_is_accessible_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case 0x00 ... 0x1A:
case 0x20 ... 0x38:
case 0x40 ... 0x49:
case 0x50 ... 0x57:
case 0x60 ... 0x67:
case 0x70 ... 0x79:
case 0x82 ... 0x85:
return true;
default:
return false;
}
}
static const struct regmap_config rt9467_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0x85,
.writeable_reg = rt9467_is_accessible_reg,
.readable_reg = rt9467_is_accessible_reg,
};
static int rt9467_check_vendor_info(struct rt9467_chg_data *data)
{
unsigned int vid;
int ret;
ret = regmap_field_read(data->rm_field[F_VENDOR], &vid);
if (ret) {
dev_err(data->dev, "Failed to get vid\n");
return ret;
}
if ((vid != RT9466_VID) && (vid != RT9467_VID))
return dev_err_probe(data->dev, -ENODEV,
"VID not correct [0x%02X]\n", vid);
data->vid = vid;
return 0;
}
static int rt9467_reset_chip(struct rt9467_chg_data *data)
{
int ret;
/* Disable HZ before reset chip */
ret = regmap_field_write(data->rm_field[F_HZ], 0);
if (ret)
return ret;
return regmap_field_write(data->rm_field[F_RST], 1);
}
static void rt9467_chg_destroy_adc_lock(void *data)
{
struct mutex *adc_lock = data;
mutex_destroy(adc_lock);
}
static void rt9467_chg_destroy_attach_lock(void *data)
{
struct mutex *attach_lock = data;
mutex_destroy(attach_lock);
}
static void rt9467_chg_destroy_ichg_ieoc_lock(void *data)
{
struct mutex *ichg_ieoc_lock = data;
mutex_destroy(ichg_ieoc_lock);
}
static void rt9467_chg_complete_aicl_done(void *data)
{
struct completion *aicl_done = data;
complete(aicl_done);
}
static int rt9467_charger_probe(struct i2c_client *i2c)
{
struct device *dev = &i2c->dev;
struct rt9467_chg_data *data;
struct gpio_desc *ceb_gpio;
int ret;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->dev = &i2c->dev;
i2c_set_clientdata(i2c, data);
/* Default pull charge enable gpio to make 'CHG_EN' by SW control only */
6.5.5
2023-10-24 12:59:35 +02:00
ceb_gpio = devm_gpiod_get_optional(dev, "charge-enable", GPIOD_OUT_HIGH);
Initial commit
2023-08-30 17:31:07 +02:00
if (IS_ERR(ceb_gpio))
return dev_err_probe(dev, PTR_ERR(ceb_gpio),
"Failed to config charge enable gpio\n");
data->regmap = devm_regmap_init_i2c(i2c, &rt9467_regmap_config);
if (IS_ERR(data->regmap))
return dev_err_probe(dev, PTR_ERR(data->regmap),
"Failed to init regmap\n");
ret = devm_regmap_field_bulk_alloc(dev, data->regmap,
data->rm_field, rt9467_chg_fields,
ARRAY_SIZE(rt9467_chg_fields));
if (ret)
return dev_err_probe(dev, ret, "Failed to alloc regmap fields\n");
ret = rt9467_check_vendor_info(data);
if (ret)
return dev_err_probe(dev, ret, "Failed to check vendor info");
ret = rt9467_reset_chip(data);
if (ret)
return dev_err_probe(dev, ret, "Failed to reset chip\n");
ret = devm_regmap_add_irq_chip(dev, data->regmap, i2c->irq,
IRQF_TRIGGER_LOW | IRQF_ONESHOT, 0,
&rt9467_irq_chip, &data->irq_chip_data);
if (ret)
return dev_err_probe(dev, ret, "Failed to add irq chip\n");
mutex_init(&data->adc_lock);
ret = devm_add_action_or_reset(dev, rt9467_chg_destroy_adc_lock,
&data->adc_lock);
if (ret)
return dev_err_probe(dev, ret, "Failed to init ADC lock\n");
mutex_init(&data->attach_lock);
ret = devm_add_action_or_reset(dev, rt9467_chg_destroy_attach_lock,
&data->attach_lock);
if (ret)
return dev_err_probe(dev, ret, "Failed to init attach lock\n");
mutex_init(&data->ichg_ieoc_lock);
ret = devm_add_action_or_reset(dev, rt9467_chg_destroy_ichg_ieoc_lock,
&data->ichg_ieoc_lock);
if (ret)
return dev_err_probe(dev, ret, "Failed to init ICHG/IEOC lock\n");
init_completion(&data->aicl_done);
ret = devm_add_action_or_reset(dev, rt9467_chg_complete_aicl_done,
&data->aicl_done);
if (ret)
return dev_err_probe(dev, ret, "Failed to init AICL done completion\n");
ret = rt9467_do_charger_init(data);
if (ret)
return ret;
ret = rt9467_register_otg_regulator(data);
if (ret)
return ret;
ret = rt9467_register_psy(data);
if (ret)
return ret;
return rt9467_request_interrupt(data);
}
static const struct of_device_id rt9467_charger_of_match_table[] = {
{ .compatible = "richtek,rt9467", },
{}
};
MODULE_DEVICE_TABLE(of, rt9467_charger_of_match_table);
static struct i2c_driver rt9467_charger_driver = {
.driver = {
.name = "rt9467-charger",
.of_match_table = rt9467_charger_of_match_table,
},
6.5.5
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.probe = rt9467_charger_probe,
Initial commit
2023-08-30 17:31:07 +02:00
};
module_i2c_driver(rt9467_charger_driver);
MODULE_DESCRIPTION("Richtek RT9467 Charger Driver");
MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_AUTHOR("ChiaEn Wu <chiaen_wu@richtek.com>");
MODULE_LICENSE("GPL");